CVE-2019-11593 — In Adblock Plus before 3

In Adblock Plus before 3.5.2, the $rewrite filter option allows filter-list maintainers to run arbitrary code in a client-side session when a web service loads a script for execution using XMLHttpRequest or Fetch, and the script origin has an open redirect.

01What is this vulnerability?

In Adblock Plus before 3.5.2, the $rewrite filter option allows filter-list maintainers to run arbitrary code in a client-side session when a web service loads a script for execution using XMLHttpRequest or Fetch, and the script origin has an open redirect.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-04-29T14:30:34.000Z
• Last modified: 2024-08-04T22:55:41.042Z

09References

• armin.dev — https://armin.dev/blog/2019/04/adblock-plus-code-injection/
• news.ycombinator.com — https://news.ycombinator.com/item?id=19666504
• adblockplus.org — https://adblockplus.org/releases/adblock-plus-352-for-chrome-firefox-and-opera-r…
• gitlab.com — https://gitlab.com/eyeo/adblockplus/adblockpluschrome/issues/1
• gitlab.com — https://gitlab.com/eyeo/adblockplus/adblockpluscore/issues/4